Shelf



FIG. 1 is a perspective view of my shelf in accordance with my invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is an opposing end view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front view thereof.

The broken lines depict portions of the article that form no part of the claimed design. The spacing between segments, or length of segments, in the broken lines may vary from one broken line to another to most clearly describe the claimed design: regardless of this possible variation, all broken lines should be interpreted as performing the same function. All unshaded surfaces shown between the broken lines and solid lines form no part of the claimed design. 

CLAIM The ornamental design for a shelf, as shown and described herein. 